The component with the lowest price in the CLUTCH YZ125E/F schematic is the Ybs66-6 Washer, Plain.
A sample from the products for the Clutch Yz125e/f include: Oil Seal (14x25x5-2h7), Plate, Friction (nas), Ybs66-6 Washer, Plain, Primary Driven Gear Comp..
In this schematic the "Plate, Friction (nas)" is used most often.